I don't remember exact formula and I'm on the phone, but as far as I
remember it depends on the parameter "processes"
Oracle performance tuning expert
Oracle Database Developer Choice Award winner
Oracle ACE Associate
On Wed, Jul 14, 2021, 16:09 Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
The following error is generated on startup if sga_target is too small:
ORA-00821: Specified value of sga_target 1024M is too small, needs to be
at least 2576M
(I defined a very small sga_target just to reproduce this error.)
The minimum 2576M seems to be host dependent, rather than hardcoded.
The MOS note “DBCA Fails With ORA-00821 Error (sga_target Is Too Small)
(Doc ID 2409633.1)” confirms my observation:
“If DBCA cannot find the initialization parameter file, it calculates
default values for processes and memory allocation. It uses the amount of
RAM, the number of cores, and the number of threads to calculate these
values and this can create a very large value for processes and increases
the size of the SGA to accommodate that value.”
How does Oracle calculate this minimum, i.e. 2576M?
Please consider the environment before printing this e-mail.
Bitte denken Sie an die Umwelt, bevor Sie dieses E-Mail drucken.
This message is intended only for the individual named. It may contain
confidential or privileged information. If you are not the named addressee
you should in particular not disseminate, distribute, modify or copy this
e-mail. Please notify the sender immediately by e-mail, if you have
received this message by mistake and delete it from your system.
Without prejudice to any contractual agreements between you and us which
shall prevail in any case, we take it as your authorization to correspond
with you by e-mail if you send us messages by e-mail. However, we reserve
the right not to execute orders and instructions transmitted by e-mail at
any time and without further explanation.
E-mail transmission may not be secure or error-free as information could
be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also
processing of incoming e-mails cannot be guaranteed. All liability of
Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively
referred to as "Vontobel Group") for any damages resulting from e-mail use
is excluded. You are advised that urgent and time sensitive messages should
not be sent by e-mail and if verification is required please request a
Please note that all e-mail communications to and from the Vontobel Group
are subject to electronic storage and review by Vontobel Group. Unless
stated to the contrary and without prejudice to any contractual agreements
between you and Vontobel Group which shall prevail in any case,
e-mail-communication is for informational purposes only and is not intended
as an offer or solicitation for the purchase or sale of any financial
instrument or as an official confirmation of any transaction.
The legal basis for the processing of your personal data is the legitimate
interest to develop a commercial relationship with you, as well as your
consent to forward you commercial communications. You can exercise, at any
time and under the terms established under current regulation, your rights.
If you prefer not to receive any further communications, please contact
your client relationship manager if you are a client of Vontobel Group or
notify the sender. Please note for an exact reference to the affected group
entity the corporate e-mail signature. For further information about data
privacy at Vontobel Group please consult www.vontobel.com.